Year	Number
1960	47498
1961	47733
1962	47946
1963	47920
1964	48021
1965	48198
1966	47784
1967	47187
1968	46760
1969	46385
1970	46071
1971	46320
1972	47092
1973	48217
1974	49643
1975	51102
1976	52612
1977	54219
1978	55963
1979	57759
1980	59614
1981	61562
1982	63580
1983	65528
1984	67274
1985	68986
1986	70803
1987	71936
1988	68917
1989	65697
1990	66707
1991	68782
1992	70439
1993	71633
1994	73943
1995	76811
1996	79129
1997	81667
1998	82681
1999	84189
2000	88026
2001	91993
2002	96006
2003	100181
2004	104646
2005	109424
2006	114543
2007	120073
2008	125960
2009	131938
2010	138903
2011	146391
2012	153137
2013	158996
2014	161374
2015	162539
2016	163241
2017	162064
2018	163074
2019	167595
2020	173079
2021	177990
2022	183129
2023	188953